William cousins



(No Madel.)

W. COUSINS.

HYDRAULIC THRUST BLOCK FOR PROPELLEB. SHAFTS. N0. 303,813.

Patented'Aug. 19, 1884.

ATTORNEYS WITNESSES UNITED STATES PATENT UFFlCEQ WVILLIAM COUSINS, OF NEWTYORK, N. Y.

HYDRAULIC THRUST-BLOCK FOR PROPELLER-SHAFT S.

SPECIFICATION forming part of Letters Patent No. 303,813, dated August 19, 1884.

Application filed February 5, 1884. (No model.)

119 (aZZ whom it ii-(Ly concern:

Be it known that I, WILLIAirGoUsINs, of the city, county, and State of New York, have invented a new and useful Improvement in llydrauli 0 Th rust-Blocks for Propeller-Shafts, of which the following is a full, clear, and exact description.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all. the figures.

Figure 1 is a sectional side elevation of my improvement. Fig. 2 is an end elevation of the same, the shaft being shown in section. Fig. 3 is a sectional side elevation of the inner end of one of the inlet-pipes.

The object of this invention is to promote durability and reliability in thrust-blocks for propeller-sheits.

The invention consists in a hydraulic thrustbloek for propeller-shafts, constructed with a piston attached to the shaft, and placed in a cylinder supplied at both ends with water by a forcepump through pipes provided with valves opened by the movements of the said piston, whereby the thrust of the shaft will be sustained by a water-cushion. The escape of water around the shaft is prevented at each end 01' the cylinder by a pair of packing-rings, separated by a partition and held against the shall? by the pressure of water entering the packing-chambers through openings in the cylinder-head and partition, as will be hereinafter fully described.

A represents the propeller-shaft, which is provided with a propeller, and is driven-in the ordinary manner. The shaft A passes through hearings in the heads B of the cylinder 0, which bearings are made water-tight by pairs of packingarings D, inserted in an nular grooves in the said bearings, and separated by partitions E. The packingrings D are held against the shaft A by the pressure of water from the cylinder 0, which enters the packing-chambers through small openings F in the heads 13 and partitions E, as shown in Fig. l. I

To the shaft A, in the middle part of the cylinder O, is attached a piston, G, the face of 'vidcd with valves 1, opening inward.

which is grooved to receive the packingring H. The packing-ring H is held out against the inner surface of the cylinder 0 by the pressure of water, which enters the packingchamber through small openings I in the flanges of the'piston G.

To the shaft A attached an eccentric, J, the eccentricstrap K of which is provided with an arm, to which is pivoted the piston rod L of an ordinary force-pump, M. The discharge-pipe N ofthe forcepuiinp M passes to and along the side of the cylinder C, and with it are connected pipes O, passing through openings in the opposite cylinder-heads B, and terminating near the sides of the piston G. The inner ends of the inlet-pipes O are pro The stems'Q of the valves P project a little beyond the ends of the pipes 0, so that should the shaft A move longitudinally in either direction it will bring the piston G in contact with the stem Q. of a valve, 1?, open the saidvalvc, and allow the pump M to three water into that end of the cylinder 0 to sustain the thrust of the said shaft. By this construc tion the friction and wear of the ordinary thrust hearings will be avoided, and the amount of power required to drive the pro peller will be greatly reduced.

Having thus described myinvention, I claim as new and desire to secure by Letters Patent- 1. A hydraulic thrust-block for propellershafts, constructed substantially as herein shown and described, and consisting of a piston attached to the shaft and placed in a cylinder supplied with water by a force -pu1np, as set forth.

2. The combination, with the propellershaft A and the force-pump iii, of the cylinder 0, the piston G, and the inlet-pipes 0, provided with valves P Q, substantially as herein shown and described, whereby the thrust of the propeller-shaftwill be sustained by a water-cushion, as set forth.

WILLIAM COUSINS.

Witnesses:

J nuns T. GRAHAM, EDGAR TATE. 

